If you want a new game go with Assassin's Creed: Origins.
If you're ok with playing an older game you can't go wrong with Elder Scrolls V: Skyrim.
If you want a co-op game then check out Killing Floor 2.
If you're into linear singleplayer games then check out Tomb Raider.
If you want an open-world sandbox game there's Grand Theft Auto V.
If you want a simulation game you might check out Cities: Skylines.

It really just depends on what type of game you're looking for, what sort of art style you're into, and whether you favor gameplay or storytelling. I'm big on games with a darker atmosphere, and I like something more linear. So Deus Ex: Mankind Divided and Rise of the Tomb Raider are right up my alley.